U.S. patent number 7,656,270 [Application Number 11/173,074] was granted by the patent office on 2010-02-02 for keyless entry device with passive and active entry modes.
This patent grant is currently assigned to Alps Electric Co., Ltd.. Invention is credited to Jun Takahashi.
United States Patent |
7,656,270 |
Takahashi |
February 2, 2010 |
Keyless entry device with passive and active entry modes
Abstract
A device includes a car-mounted transmitter-receiver and a
portable transmitter-receiver. The car-mounted transmitter-receiver
includes a first memory that stores the ID of the portable
transmitter-receiver and a second memory that stores the ID of the
car-mounted transmitter-receiver. The portable transmitter-receiver
includes a first memory that stores the ID of the car-mounted
transmitter-receiver and a second memory that stores the ID of the
portable transmitter-receiver. The transmission and reception of
radio signals between the car-mounted transmitter-receiver and the
portable transmitter-receiver are made in one of an active entry
mode and a passive entry mode, in whichever entry mode the
transmitted signal contains the ID of the car-mounted
transmitter-receiver and the ID of the portable
transmitter-receiver, and in the active entry mode, the signal
transmitted by the portable transmitter-receiver further contains
an instruction signal that controls a device being controlled
disposed in the car.
Inventors: |
Takahashi; Jun (Tokyo,
JP) |
Assignee: |
Alps Electric Co., Ltd. (Tokyo,
JP)
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Family
ID: |
35094427 |
Appl.
No.: |
11/173,074 |
Filed: |
July 1, 2005 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20060006984 A1 |
Jan 12, 2006 |
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Foreign Application Priority Data
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Jul 9, 2004 [JP] |
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2004-203383 |
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Current U.S.
Class: |
340/5.72;
340/5.61; 340/426.36 |
Current CPC
Class: |
B60R
25/24 (20130101); G07C 9/00309 (20130101); G07C
2009/00793 (20130101) |
Current International
Class: |
G05B
19/00 (20060101) |
Field of
Search: |
;340/5.72,5.61,426.36,5.7,5.6,5.62,5.63,5.64,5.65 |
References Cited
[Referenced By]
U.S. Patent Documents
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5594429 |
January 1997 |
Nakahara |
5841363 |
November 1998 |
Jakob et al. |
6317035 |
November 2001 |
Berberich et al. |
6617961 |
September 2003 |
Janssen et al. |
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Foreign Patent Documents
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2000-192701 |
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Jul 2000 |
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JP |
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2000192701 |
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Jul 2000 |
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JP |
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WO 99/23335 |
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May 1999 |
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WO |
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Primary Examiner: Zimmerman; Brian A
Assistant Examiner: Jiang; Yong Hang
Attorney, Agent or Firm: Brinks Hofer Gilson & Lione
Claims
What is claimed is:
1. A keyless entry device comprising a car-mounted
transmitter-receiver mounted in a vehicle and a portable
transmitter-receiver, the keyless entry device comprising: the
car-mounted transmitter-receiver including a signal
transmitter-receiver, a controller, a first memory that stores an
ID assigned to the portable transmitter-receiver, and a second
memory that stores an ID assigned to the car-mounted
transmitter-receiver; and the portable transmitter-receiver
including a signal transmitter-receiver, a controller, a key
switch, a first memory that stores the ID assigned to the
car-mounted transmitter-receiver, and a second memory that stores
the ID assigned to the portable transmitter-receiver; wherein the
transmission and reception of radio signals between the car-mounted
transmitter-receiver and the portable transmitter-receiver are made
in one of an active entry mode and a passive entry mode, in both
entry modes the transmitted signals contain the ID of the
car-mounted transmitter-receiver and the ID of the portable
transmitter-receiver, and in the active entry mode, the signal
transmitted by the portable transmitter-receiver further contains
an instruction signal corresponding to the operation of the key
switch, the instruction signal controlling a selected mechanism
disposed in the vehicle; and wherein the ID of the portable
transmitter-receiver is registered by radio in the vehicle.
2. The keyless entry device according to claim 1, wherein when a
request signal is transmitted in a passive entry mode, the
controller of the car-mounted transmitter-receiver makes the
transmitted signal contain the ID of the car-mounted
transmitter-receiver and the ID of the portable
transmitter-receiver; when the request signal is a specified
request signal, the controller of the portable transmitter-receiver
transmits an answer signal that contains the ID of the car-mounted
transmitter-receiver and the ID of the portable
transmitter-receiver, wherein when the answer signal contains a
specified ID, the controller of the car-mounted
transmitter-receiver controls a selected device disposed in the
vehicle; and the controller of the portable transmitter-receiver
transmits a signal that contains the instruction signal, the ID of
the car-mounted transmitter-receiver, and the ID of the portable
transmitter-receiver in an active entry mode, wherein when the
signal contains the specified ID, the controller of the car-mounted
transmitter-receiver controls the selected device disposed in the
vehicle.
3. The keyless entry device according to claim 2, wherein the
device being controlled is a door-lock drive mechanism.
4. A keyless entry device comprising a car-mounted
transmitter-receiver mounted in a vehicle and a portable
transmitter-receiver, the keyless entry device comprising: the
car-mounted transmitter-receiver including a signal
transmitter-receiver, a controller, a first memory that stores an
ID assigned to the portable transmitter-receiver, and a second
memory that stores an ID assigned to the car-mounted
transmitter-receiver; and the portable transmitter-receiver
including a signal transmitter-receiver, a controller, a key
switch, a first memory that stores the ID assigned to the
car-mounted transmitter-receiver, and a second memory that stores
the ID assigned to the portable transmitter-receiver; wherein the
transmission and reception of radio signals between the car-mounted
transmitter-receiver and the portable transmitter-receiver are made
in one of an active entry mode and a passive entry mode, in both
entry modes the transmitted signals contain the ID of the
car-mounted transmitter-receiver and the ID of the portable
transmitter-receiver, and in the active entry mode, the signal
transmitted by the portable transmitter-receiver further contains
an instruction signal corresponding to the operation of the key
switch, the instruction signal controlling a selected mechanism
disposed in the vehicle; and wherein the first memory of the car
mounted transmitter-receiver stores the ID assigned to the portable
transmitter-receiver only when the ID assigned to the car mounted
transmitter-receiver stored in the second memory of the car-mounted
transmitter-receiver agrees with the ID assigned to the car mounted
transmitter-receiver stored in the first memory of the portable
transmitter-receiver.
5. The keyless entry device according to claim 1 comprising: a
writing device connected to the portable transmitter-receiver,
wherein an ID assigned to the car-mounted transmitter-receiver is
registered in the portable transmitter-receiver; and after the
car-mounted transmitter-receiver is set to a registration mode, a
signal containing the ID of the portable transmitter-receiver is
transmitted from the portable transmitter-receiver, and the ID
assigned to the portable transmitter-receiver is registered in the
car-mounted transmitter-receiver.
Description
This application claims the benefit of priority to Japanese Patent
Application No. 2004-203383 filed on Jul. 9, 2004, herein
incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a keyless entry device including a
car-mounted transmitter-receiver and a portable
transmitter-receiver, and in particular, it relates to a key entry
device in which one portable transmitter-receiver can be used only
for one car-mounted transmitter-receiver even when one portable
transmitter-receiver ID is registered for two car-mounted
transmitter-receivers in a car manufacturing process.
2. Description of the Related Art
Vehicles such as cars generally have locks for doors to prevent
theft or intrusion and breakage when not used. Doors have been
locked or unlocked by inserting a key for starting an engine into a
keyhole. However, so-called active keyless entry devices have come
into use for convenience in which doors are locked or unlocked by
operating the switch of a portable transmitter-receiver without
inserting a key into a keyhole. Furthermore, so-called passive
keyless entry devices have come into use in recent years in which
doors can be locked or unlocked automatically without operating the
switch but with a specified portable transmitter-receiver and in
position. The passive keyless entry devices are generally given the
function of the active keyless entry devices, or the function of
the active entry, and some devices are given an electrical
identifying function for engine startup to prevent the engine from
starting until identification is made between a car and a portable
transmitter-receiver, thereby increasing security.
This type of passive keyless entry devices having the function of
the active keyless entry devices include an active keyless entry
device in which an operation switch is disposed on the portable
transmitter-receiver, wherein when a user operates the operation
switch of the portable transmitter-receiver, the portable
transmitter-receiver generates an instruction signal corresponding
to the operation mode and transmits the generated instruction
signal to a car-mounted transmitter-receiver by radio, and a
passive keyless entry device in which the car-mounted
transmitter-receiver generates a low-frequency signal including a
wakeup signal and a data signal at regular intervals, transmits the
generated low-frequency signal to the portable transmitter-receiver
by radio, wherein when the portable transmitter-receiver has
received the low-frequency signal, the portable
transmitter-receiver generates a radio-frequency signal including
an instruction signal and transmits the generated radio-frequency
signal by radio (for example, refer to Japanese Unexamined Patent
Application Publication No. 2000-320212).
In this case, the active keyless entry devices transmit an
instruction signal to the car-mounted transmitter-receiver by radio
by the user operating the operation switch of the portable
transmitter-receiver and as such, devices disposed in the vehicle
cannot be operated unless the user etc. operates the operation
switch of the portable transmitter-receiver, so that the
door-locked state of the vehicle does not change to an unlock state
by mistake.
On the other hand, for the passive keyless entry devices, radio
signals are transmitted or received between the portable
transmitter-receiver and the car-mounted transmitter-receiver
without operating the operation switch of the portable
transmitter-receiver to allow automatic operation of the devices
disposed in the vehicle, thus having higher functionality than that
of the active keyless entry devices.
In such keyless entry devices, the ID of the portable
transmitter-receiver is registered in the car-mounted
transmitter-receiver so as to bring the car-mounted
transmitter-receivers mounted on a vehicle into correspondence with
a portable transmitter-receiver used therefor. In this case, a
portable transmitter-receiver in which an ID unique to the portable
transmitter-receiver is written to its ROM is first prepared. In
registration of the ID of the portable transmitter-receiver to the
car-mounted transmitter-receiver, the car-mounted
transmitter-receiver is set in a registration mode in which the ID
of the portable transmitter-receiver is registered, and then a
switch disposed on the portable transmitter-receiver is operated,
as in the active entry mode, to transmit a signal containing the ID
from the portable transmitter-receiver. When the car-mounted
transmitter-receiver has received the signal, the ID of the
portable transmitter-receiver contained in the signal is written to
an RAM provided in the car-mounted transmitter-receiver. Then a
signal containing the ID of the portable transmitter-receiver and
an instruction is transmitted by switch operation to identify the
ID of the portable transmitter-receiver, which is registered in the
car-mounted transmitter-receiver, wherein when identification has
been made, the door is locked or unlocked according to the
specified instruction signal. While the registration of the ID of
the portable transmitter-receiver is generally made by vehicle
manufacturers during a vehicle manufacturing process, it is
sometimes made by vehicle dealers or rarely by a user who bought
the vehicle, for example, when the portable transmitter-receiver
was lost or when an additional portable transmitter-receiver is
used.
Since the registration of the ID of the portable
transmitter-receiver to the car-mounted transmitter-receiver is
made to specify a portable transmitter-receiver used for the
car-mounted transmitter-receiver as described above, duplicate
registration of the ID of one portable transmitter-receiver to two
or more car-mounted transmitter-receivers is not generally
intended. However, for registration of the ID by a vehicle dealer,
when the car-mounted transmitter-receivers of multiple vehicles are
set in a portable transmitter-receiver registration mode, the ID of
one portable transmitter-receiver will be registered in the
car-mounted transmitter-receivers of the multiple vehicles at the
transmission by the portable transmitter-receiver.
When the ID of one portable transmitter-receiver is registered in
two or more car-mounted transmitter-receivers, two or more
car-mounted transmitter-receivers can be controlled in normal
service condition by using one portable transmitter-receiver, or in
other words, the door lock of vehicles that mount the car-mounted
transmitter-receivers can freely be controlled, which is not
desirable for the purpose of keyless entry devices.
With another structure in which the ID of the car-mounted
transmitter-receiver is written manually to individual portable
transmitter-receiver using an additional writing device, and a
signal containing the IDs of the portable transmitter-receiver and
the car-mounted transmitter-receiver is sent at the transmission of
a request signal by a passive entry, wherein when the IDs agree
with each other in the portable transmitter-receiver, an answer
signal is generated to unlock the door, the ID of the car-mounted
transmitter-receiver is different from that, so that no
identification is made to prevent unlock. On the other hand, for
active entry, the identification is made only with the ID of the
portable transmitter-receiver to allow door lock, thus posing the
problem of difficulty in determining whether the malfunction is
caused by failure or misregistration of the ID, because many
vehicle dealers do not generally know the details of identification
method.
SUMMARY OF THE INVENTION
The present invention has been made in light of such technical
circumstances, and has as an object the provision of a keyless
entry device in which when an incorrect ID of a portable
transmitter-receiver is registered in a car-mounted
transmitter-receiver, door lock is not activated to allow the
misregistration to be found easily, permitting proper correction of
the correspondence between the car-mounted transmitter-receiver and
the portable transmitter-receiver and in which determinations on
the identification of ID in the passive entry mode and the active
entry mode are agreed with each other to allow the misregistration
to be found easily, permitting proper correction of the
correspondence between the car-mounted transmitter-receiver and the
portable transmitter-receiver.
In order to achieve the above object, according to an aspect of the
invention, there is provided a keyless entry device including a
car-mounted transmitter-receiver mounted in a vehicle and a
portable transmitter-receiver. The keyless entry device has the
following structure:
The car-mounted transmitter-receiver includes a signal
transmitter-receiver, a controller, a first memory that stores an
ID assigned to the portable transmitter-receiver, and a second
memory that stores an ID assigned to the car-mounted
transmitter-receiver; the portable transmitter-receiver includes a
signal transmitter-receiver, a controller, a key switch, a first
memory that stores the ID assigned to the car-mounted
transmitter-receiver, and a second memory that stores the ID
assigned to the portable transmitter-receiver; wherein the
transmission and reception of radio signals between the car-mounted
transmitter-receiver and the portable transmitter-receiver are made
in one of an active entry mode and a passive entry mode, in
whichever entry mode the transmitted signal contains the ID of the
car-mounted transmitter-receiver and the ID of the portable
transmitter-receiver, and in the active entry mode, the signal
transmitted by the portable transmitter-receiver further contains
an instruction signal corresponding to the operation of the key
switch, the instruction signal including an instruction signal that
controls a device being controlled disposed in the vehicle.
With the keyless entry device according to an embodiment of the
invention, the transmission and reception of radio signals between
the car-mounted transmitter-receiver and the portable
transmitter-receiver are made in one of an active entry mode and a
passive entry mode, in whichever entry mode the transmitted signal
contains the ID of the car-mounted transmitter-receiver and the ID
of the portable transmitter-receiver, and in the active entry mode,
the signal transmitted by the portable transmitter-receiver further
contains an instruction signal that controls a device being
controlled disposed in the vehicle and as such, misregistration can
be found immediately, offering the advantage of bringing a
car-mounted transmitter-receiver into one-to-one correspondence
with portable transmitter-receivers used therefor.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an example of the structure of
essential parts of a car-mounted transmitter-receiver used for a
keyless entry device according to an embodiment of the invention;
and
FIG. 2 is a block diagram of an example of the structure of
essential parts of a portable transmitter-receiver used for the
keyless entry device according to the embodiment of the
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
An embodiment of the invention will be described hereinbelow with
reference to the drawings.
FIG. 1 is a block diagram of an example of the structure of
essential parts of a car-mounted transmitter-receiver 10 used for a
keyless entry device according to an embodiment of the
invention.
As shown in FIG. 1, the car-mounted transmitter-receiver 10
according to the embodiment includes a low-frequency signal
transmitter (LF TX) 1, a transmitting low-frequency antenna 2, a
radio-frequency signal receiver (RF RX) 3, a receiving
radio-frequency antenna 4, a controller (CPU) 5, a first memory 6,
and a second memory 7. The car-mounted transmitter-receiver 10
connects to a door-lock drive mechanism 8 and an engine start
mechanism 9 on the outside. In this case, the low-frequency signal
transmitter 1 connects to the controller 5 at the input terminal
and to the transmitting low-frequency antenna 2 at the output
terminal. The radio-frequency signal receiver 3 connects to the
receiving radio-frequency antenna 4 at the input terminal and to
the controller 5 at the output terminal. The first memory 6 and the
second memory 7 connect to the controller 5. The controller 5
connects to the door-lock drive mechanism 8 and the engine start
mechanism 9. The first memory 6 stores an ID (hereinafter, referred
to as a K-ID) assigned to a portable transmitter-receiver 20, to be
described later. The second memory 7 stores an ID (hereinafter,
referred to as a V-ID) assigned to the car-mounted
transmitter-receiver 10.
FIG. 2 is a block diagram of an example of the structure of
essential parts of a portable transmitter-receiver 20 used for the
keyless entry device according to the embodiment of the
invention.
As shown in FIG. 2, the portable transmitter-receiver 20 according
to the embodiment includes a radio-frequency signal transmitter (RF
TX) 11, a transmitting radio-frequency antenna 12, a low-frequency
signal receiver (LF RX) 13, a receiving low-frequency antenna 14, a
controller (CPU) 15, a first memory 16, a second memory 17, and a
key switch 18. The radio-frequency signal transmitter 11 connects
to the controller 15 at the input terminal and to the transmitting
radio-frequency antenna 12 at the output terminal. The
low-frequency signal receiver 13 connects to the receiving
low-frequency antenna 14 at the input terminal and to the
controller 15 at the output terminal. The first memory 16, the
second memory 17, and the key switch 18 connect to the controller
15. The first memory 16 stores the V-ID assigned to the car-mounted
transmitter-receiver 10. The second memory 17 stores the K-ID
assigned to the portable transmitter-receiver 20.
The operation of the keyless entry device according to the
embodiment will be described.
The keyless entry device performs a passive entry and an active
entry selectively. The operations will now be described in
order.
The passive entry of the keyless entry device will first be
described.
At a radio signal transmission timing of the car-mounted
transmitter-receiver 10, the controller 5 reads the K-ID of the
portable transmitter-receiver 20 from the first memory 6 and reads
the V-ID of the car-mounted transmitter-receiver 10 itself from the
second memory 7, generates a low-frequency signal containing the
K-ID, V-ID, and a wakeup signal, and provides the generated
low-frequency signal to the low-frequency signal transmitter 1. The
low-frequency signal transmitter 1 amplifies the provided
low-frequency signal to a signal level suitable for transmission
and then transmits it as a radio signal via the transmitting
low-frequency antenna 2.
Then, the low-frequency signal receiver 13 of the portable
transmitter-receiver 20 receives the radio signal sent from the
car-mounted transmitter-receiver 10 via the receiving low-frequency
antenna 14, then amplifies the received low-frequency signal to a
specified signal level, and sends the amplified low-frequency
signal to the controller 15. When the low-frequency signal is
provided, the controller 15 reads the V-ID of the car-mounted
transmitter-receiver 10 from the first memory 16, and the K-ID of
the portable transmitter-receiver 20 from the second memory 7,
respectively, extracts the K-ID of the portable
transmitter-receiver 20 and the V-ID of the car-mounted
transmitter-receiver 10 which are contained in the low-frequency
signal, and determines whether they agree with each other. When the
controller 15 determines that they agrees, it reads the V-ID of the
car-mounted transmitter-receiver 10 from the first memory 16, and
the K-ID of the portable transmitter-receiver 20 from the second
memory 17, generates a radio-frequency signal (answer signal)
containing the V-ID, K-ID, and the instruction signal, and provides
the generated radio-frequency signal to the radio-frequency signal
transmitter 11. Upon reception of the radio-frequency signal, the
radio-frequency signal transmitter 11 amplifies the provided
radio-frequency signal to a signal level suitable for transmission
and then transmits it as a radio signal via the transmitting
radio-frequency antenna 12. When the controller 15 determines that
one or both of the IDs do not agree, it discards the provided
low-frequency signal and executes no following operations.
Subsequently, the radio-frequency signal receiver 3 of the
car-mounted transmitter-receiver 10 receives the radio signal sent
from the portable transmitter-receiver 20 via the receiving
radio-frequency antenna 4, then amplifies the received
radio-frequency signal to a specified signal level, and provides
the amplified radio-frequency signal to the controller 5. Upon
reception of the radio-frequency signal, the controller 5 reads the
K-ID of the portable transmitter-receiver 20 from the first memory
6, and the V-ID of the car-mounted transmitter-receiver 10 from the
second memory 7, respectively, and extracts the K-ID of the
portable transmitter-receiver 20 and the V-ID of the car-mounted
transmitter-receiver 10 which are contained in the radio-frequency
signal, and determines whether they agree with each other. When the
controller 5 determines that they agrees, it generates a control
signal that controls the condition of the vehicle-side device being
controlled, for example, a control signal that changes the lock
mode of the door-lock drive mechanism 8 to an unlock mode,
according to the instruction signal contained in the
radio-frequency signal, and provides the generated control signal
to the door-lock drive mechanism 8 to set the door in an unlocked
condition. Also in this case, when the controller 5 determines that
one or both of the IDs do not agree, it discards the provided
radio-frequency signal and executes no following operations.
The embodiment has been described for the case in which the device
being controlled is the door-lock drive mechanism 8. However, the
invention is applicable to the control for a so-called immobilizer
that controls the engine start mechanism 9 into a startable mode
when the portable transmitter-receiver 20 is determined to be
present in the vehicle cabin. The device being controlled is not
necessarily the two mechanisms 8 and 9, but may be other
devices.
The active entry of the keyless entry device will then be
described.
When a user etc. who carries the portable transmitter-receiver 20
operates the key switch 18 indicative of door lock or unlock, an
instruction signal corresponding to the operation is generated from
the key switch 18 and supplied to the controller 15. Upon reception
of the instruction signal, the controller 15 reads the V-ID of the
car-mounted transmitter-receiver 10 from the first memory 16, and
the K-ID of the portable transmitter-receiver 20 from the second
memory 17, respectively, and generates a radio-frequency signal
containing the V-ID, K-ID, and the instruction signal and sends the
generated radio-frequency signal to the radio-frequency signal
transmitter 11. Upon reception of the radio-frequency signal, the
radio-frequency signal transmitter 11 amplifies the radio-frequency
signal to a signal level suitable for radio transmission and sends
the amplified radio-frequency signal by radio via the transmitting
radio-frequency antenna 12.
Then, the radio-frequency signal receiver 3 of the car-mounted
transmitter-receiver 10 receives the radio signal sent from the
portable transmitter-receiver 20 via the receiving radio-frequency
antenna 4, then amplifies the received radio-frequency signal to a
specified signal level, and provides the amplified radio-frequency
signal to the controller 5. Upon reception of the radio-frequency
signal, the controller 5 reads the K-ID of the portable
transmitter-receiver 20 from the first memory 6, and the V-ID of
the car-mounted transmitter-receiver 10 from the second memory 7,
respectively, and extracts the K-ID of the portable
transmitter-receiver 20 and the V-ID of the car-mounted
transmitter-receiver 10 which are contained in the radio-frequency
signal, and determines whether they agree with each other. When the
controller 5 determines that they agrees, it generates a control
signal that controls the condition of the vehicle-side device being
controlled, for example, a control signal that changes the lock
mode of the door-lock drive mechanism 8 to an unlock mode,
according to the instruction signal contained in the
radio-frequency signal, and provides the generated control signal
to the door-lock drive mechanism 8 to set the door in an unlocked
condition. Also in this case, when the controller 5 determines that
one or both of the IDs do not agree, it discards the sent
radio-frequency signal and executes no following operations.
In the keyless entry device according to this embodiment, the K-ID
of the portable transmitter-receiver 20 is stored in the first
memory 6 of the car-mounted transmitter-receiver 10, and the V-ID
of the car-mounted transmitter-receiver 10 is stored in the second
memory 7, while the V-ID of the car-mounted transmitter-receiver 10
is stored in the first memory 16 of the portable
transmitter-receiver 20, and the K-ID of the portable
transmitter-receiver 20 is stored in the second memory 17. Then
radio signals containing the V-ID and the K-ID are transmitted or
received between the car-mounted transmitter-receiver 10 and the
portable transmitter-receiver 20, and moreover, the suitability of
the V-ID and the K-ID is determined at the reception of the radio
signals. This allows one-to-one correspondence of the portable
transmitter-receiver 20 and the car-mounted transmitter-receiver
10.
The keyless entry device according to the embodiment is allowed to
select the passive entry mode and the active entry mode of the
car-mounted transmitter-receiver 10 and the portable
transmitter-receiver 20. Accordingly, the operational function of
the keyless entry device can be improved.
The operation of the registration of an ID to the keyless entry
device will next be described.
A new portable transmitter-receiver 20 in which the K-ID is written
to the second memory 17 (ROM) during a manufacturing process is
first prepared.
A writing device (not shown) is connected to the portable
transmitter-receiver 20, with which the V-ID of the car-mounted
transmitter-receiver 10, which is known in advance, is inputted
manually to the first memory 16 (RAM).
Then the on-off of an ignition switch is repeated and so on to
bring the car-mounted transmitter-receiver 10 into a registration
mode. In this case, in the second memory 7 (ROM) of the car-mounted
transmitter-receiver 10 is written the V-ID written at a
manufacturing process, while the first memory 6 (RAM) stores the
K-IDs of the portable transmitter-receiver 20 that is used at
present and a lost portable transmitter-receiver 20. When the
car-mounted transmitter-receiver 10 is brought into a registration
mode, the data in the first memory 6 becomes rewritable. During a
fixed time in the registration mode, the key switches 18 of the
present portable transmitter-receiver 20 and the new portable
transmitter-receiver 20 are pushed in order to send signals from
the portable transmitter-receiver 20. At that time, the car-mounted
transmitter-receiver 10 writes the received K-IDs into the first
memory 6 one by one, and after a lapse of a specified time, the
registration mode is cancelled.
When the key switch 18 of the portable transmitter-receiver 20 is
pushed with the car-mounted transmitter-receivers 10 of multiple
vehicles disposed in proximity and in a registration mode, an
identical K-ID is registered in the multiple car-mounted
transmitter-receivers 10. In this case, the first memory 16 of the
portable transmitter-receiver 20 stores only the V-ID of a
specified car-mounted transmitter-receiver 10. Also, in this
embodiment, a signal containing the K-ID and the V-ID is sent and
identified during the passive entry mode and the active entry mode,
as has been described. Thus the car-mounted transmitter-receiver 10
operates only by a specified portable transmitter-receiver 20 and,
when the portable transmitter-receiver 20 is registered in the
car-mounted transmitter-receiver 10 by mistake, the passive entry
or the active entry is not made and as such, the misregistration
can be found immediately.
According to this embodiment, to register the K-IDs of the portable
transmitter-receivers 20 to the car-mounted transmitter-receiver
10, the K-IDs are written to the first memory 6 when a signal is
sent from the portable transmitter-receiver 20. Alternatively, the
K-IDs may be written on the premise that the V-IDs agree. However
when the V-IDs do not agree, the K-IDs are not written to the first
memory 6 of the car-mounted transmitter-receiver 10. The user may
be notified of it.
* * * * *